HP StorageWorks 60 Modular Smart Array Enclosure Maintenance and Service Guide (405865-002, August 2007)

Removal and replacement procedures 21
You can replace hard drives without powering down the system. However, before replacing a degraded
drive:
• Open HP SIM and inspect the Error Counter window for each physical drive in the same array to
confirm that no other drives have any errors. (For details, refer to the HP SIM documentation on the
Management CD.)
• Be sure that the array has a current, valid backup.
• Use replacement drives that have a capacity at least as great as that of the smallest drive in the
array. The controller immediately fails drives that have insufficient capacity.
To minimize the likelihood of fatal system errors when removing failed drives, take the following
precautions:
• Do not remove a degraded drive if any other drive in the array is offline (the online LED is off). In this
situation, removing any other drive in the array causes data loss.
Exceptions:
• When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be in a failed condition
simultaneously (and they can all be replaced simultaneously) without data loss, if no two failed
drives belong to the same mirrored pair.
• When RAID 6 with ADG is used, two drives can fail simultaneously (and be replaced
simultaneously) without data loss.
• If the offline drive is a spare, the degraded drive can be replaced.
• Do not remove a second drive from an array until the first failed or missing drive has been replaced
and the rebuild process is complete. (The rebuild is complete when the online LED on the front of the
drive stops blinking.)
Exceptions:
• In RAID 1+0 configurations, any drives that are not mirrored to other removed or failed drives
can be simultaneously replaced offline without data loss.
• In RAID 6 with ADG configurations, any two drives in the array can be replaced simultaneously.
To remove the component:
1. Determine the status of the hard drive from the hot-plug hard drive LEDs.
2. Back up all data on the hard drive.
CAUTION: To prevent improper cooling and thermal damage, do not operate the storage enclosure unless
all bays are populated with either a component or a blank.